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arXiv 0903.1835cond-mat.supr-concond-mat.str-el
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磁欠掺杂铜氧化物超导体的普适行为和双组分特性

Universal Behavior and the Two-component Character of Magnetically Underdoped Cuprate Superconductors

Victor Barzykin, David Pines

摘要:

我们提出了一个详细的审查的磁欠掺杂铜酸盐超导体(空穴掺杂小于0.20)的标度行为,并表明它反映了存在两个耦合组件在整个掺杂制度:一个非朗道费米液体和自旋液体的行为映射到理论Monte Carlo计算的2D海森堡模型的局部铜自旋的大部分温度域。我们使用这个映射提取的强度,$f(x)$的自旋液体组分和有效的相互作用,J_eff(x)之间的剩余局域自旋,组成它的掺杂依赖性,我们发现两者都随着x的掺杂水平的增加线性下降。我们讨论了赝能隙行为的物理起源,并得出结论,这与费米液体准粒子和自旋液体激发之间的耦合导致正常态中的大能隙及其随后的超导性的情况是一致的。并且1-2-3和2-1-4材料之间的这种耦合的差异可以解释它们的超导转变温度和其它性质的测量差异。

英文摘要:

We present a detailed review of scaling behavior in the magnetically underdoped cuprate superconductors (hole dopings less than 0.20) and show that it reflects the presence of two coupled components throughout this doping regime: a non-Landau Fermi liquid and a spin liquid whose behavior maps onto the theoretical Monte Carlo calculations of the 2D Heisenberg model of localized Cu spins for most of its temperature domain. We use this mapping to extract the doping dependence of the strength, $f(x)$ of the spin liquid component and the effective interaction, J_eff(x) between the remnant localized spins that compose it; we find both decrease linearly with x as the doping level increases. We discuss the physical origin of pseudogap behavior and conclude that it is consistent with scenarios in which the both the large energy gaps found in the normal state and their subsequent superconductivity are brought about by the coupling between the Fermi liquid quasiparticles and the spin liquid excitations, and that differences in this coupling between the 1-2-3 and 2-1-4 materials can explain the measured differences in their superconducting transition temperatures and other properties.

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